How do I start genuinely standing up for Myself?

Saying what I want MORE In MY Life, want to do, speaking up for my Personality more and complaining against rude arrogant people? as I've had imbecile managers at work overstep their mark, police officers have talked rudely to me, stupid people judge my clothes and way of life for things I haven't experienced as they somehow view ME as the one on the outside looking in at them doing all the good stuff but those who judge me don't really have a right to as Only "GOD" can Judge ME and how could they judge me unless they was me, overheard people talking about me and haven't confronted them on it, rude and INCOMPETENT teachers take their anger at their own problems out on Me and talk down to me like they were somehow better than me when they so obviously weren't, my brothers BIG idiot of a friend who has known me for "YEARS" talking down to me like he's better than Me - try to unfairly ridicule me about something that's MORE than a little Personal to Me and friends of mine go too far treating me like I'm nothing when I am "SOMETHING' and fully count!!! As I've had people put me and my way of life down, and it's just not right as I'm just as "GOOD" as EVRY1 ELSE!!! I'm a nice, polite person with a quiet way about him and I just look to get on with everyone but they just don't want that there!!! And my problem is that I never speak up and complain when the complaint is fully relevant. And how do I say what I want, and what I want to do in MY Life as well? - as I know I've got it in me I just need to get it out me is all!!! As me, my artistic beliefs and way of life count just like Everyone else's in this WORLD!!! I need to speak up and stop hesitating as I need to project my "CONFIDENCE" to everyone Family, Friends, strangers more as I just know it's in me, I'm a nice polite person and will always look to get on with people and talk in a polite manner but still I have let all sorts of people get away with way too much!!! I am a nice person and will always seek to be a nice person but just need to complain more, as it's just ME "AGAINST" The World - I don't mean that I'm selfish as I have love for my Family and Friends but still have to cover my own back !!! I don't look to start arguments as this is not a good thing - to be argumentative and I will always be a nice person!!! But think I need to Speak MY Mind more on a few things is all!!! People trying to tell me how to act and be when they don't even know for themselves, I want my respect as I wont be denied - I know that in Life Necessity is more important than respect - doing what's necessary to get to point b from point a but I'm not a joke and sick and tired of people treating me like I'm one!!! I'll Man up as I'm a Soldier For Sure!!! I've started it Today and will continue as I'm sick and tired of idiots steady quizzing ME!!! As I now live by the adage "if you don't ask you don't get"!!! People saying this is that, people saying that is this - but what do they know, they know nothing!!! And anyone who doesn't like me in this World, please feel free to JOG ON as I'm not such a bad guy at the Heart of it All!!! I know thus for sure I need to complain MORE and look to complain!!!